Surfacing-machine.



A. G. FERRARINI.

SURFACING MACHINE. APPLICATION FILED mmzs, 1914.

1, 1 34, 1 1 6. Patented Apr. 6, 1915.

A TTORNE Y.

ANTONIO G. FERRARINI, OF CHICAGO, IL LIN 01$.

SURFACING-MACHINE.

Specification of Letters Patent.

Patented Apr. 6, 1915.

Application filed January 29, 1914. Serial. No. 815,180.

To all whom it may concern Be it known that I, ANTONIO G. FERRARINI, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Surfacing-Machines, of which the following is a specification.

My invention relates to a surfacing or polishing machine, and has, for its primary object, to provide a machine for rubbing, polishing or surfacing terrazzo or other stone work, or composition work, particularly the terrazzo wainscoating and cove bases of walls, for example, in the corridors or vestibules of fireproof buildings, which machine will be simple in its construction, inexpensive to manufacture, light, compact, and so constructed that the stone dust from the surfacing or polishing operation cannot readily get into the working parts of the machine and clog the same.

A further object of the invention is to provide a device of this character comprising a surfacing or polishing element and a handle or supporting member, in which the surfacing or polishing element has a flexible and preferably yielding relation with the handle or supporting member so that the polishing surface of the polishing element will accommodate itself to and lie fiatwise against the surface upon which the machine operates even if the machine is not held with its axis accurately normal to the wall. In practice, in handling a machine of this character, it is very diflicult for the operator to hold it in a position perfectly perpendicular to the surface operated upon. It is, nevertheless, essential that the polishing element should lie fiatwise against the wall in order to produce the desired smooth plane surface. v

The invention has, for further objects. such other new and improved arrangements, devices and constructions relating to surfacing and polishing machines, and particularly to machines for surfacing and polishing vertical walls and their curved or cove bases, as will be hereinafter described and claimed.

The invention is illustrated in a preferred embodiment in the accompanying drawing, wherein- Figure 1 is a longitudinal sectional view of the apparatus; Fig. 2 a cross sectional indicate like parts in the several figures of the drawing.

The machine shown in the drawing con sists of a revoluble carrier 10 for a surfacing element 11, a handle 12, a driving shaft '13 for revolving the carrier 10, and certain devices to be hereinafter described, for mounting the carrier on the handle yieldin'gly and so as to permit the handle to assume dif ferent angular positions with respect to the carrier.

The carrier 10 consists of a disk, to the outer face of which the surfacing element is secured by any suitable means, preferably by shellacking the parts together. The surfacing element is preferably made of carborundum, is formed with a central perforation 14, and may have its working face rounded off as shown, so that it can operate upon the curved surface or cove base designated a in the drawing, which frequently intervenes between the wainscoat b and the floor' In order to better secure the surfacing element 12 to the carrier, the latter. is provided, on its outer face, with a conical member 15, secured to the carrier by a screw 16 so as to project into the perforation llof the surfacing element. The shellac, desig nated 17, flows into the undercut recess between the member 15 and the surfacingelement thereby making the hold of the surfacing element on the carrier more secure and permanent.

Secured to the carrier are a plurality of guide rods 18 which project loosely through openings 19 in a spring abutmentplate 20 which is rigidly secured to the driving shaft 13, for example, by. a key 21. Surrounding said guide rods and interposed between the carrier and the abutment plate 20 are spiral springs 22. The guide rods 18 are preferably provided with stop nuts 23, fixed to the rods by pins 24. The carrier is formed with a cylindrical cap like projection 25, having a polygonal, preferably triangular, opening 26 in its end wall, into which extends the end 27 of the driving shaft 13, the

latter having the same cross sectional configuration as openings 26 but being smaller in its dimensions so as to allow it to assume different angular positions in said opening. Preferably the plate 20 is formed with a boss 28 having a circular groove 29 to receive the end of the hollow supporting or handle member 12. A hollow sleeve or extension member 30-is preferably secured to the memsembling opening in the member 12 opposite the screw 37 being preferably closed b a screw plug 39. The inner bearing is pre erably identical in its construction with the outer bearings, except that the positions of the ball races are reversed.

On the end of the outer section'32 of the driving shaft is a pinion 40 meshed with a pinion 41 on' the end of a shaft 42 revolubly mounted in casing 43 hinged to the end of the member 30. Power is ap lied to the shaft 42 by any suitable means {not shown). It will be understood that pinions 40 and 41 remain in mesh at various different angular positions of shafts 32 and 42. 1

Preferably a housing 44, which is secured to the carrier 10 by screws 45, surrounds the springs and their abutment plate 20 so as to keep the stone dust from the surfacing operation from contact with the working parts of the machine.

Operation: The operator holds the ma chine by its supporting member or handle 12, 30, moving it up and down or from side to side within the working radius of the machine and pressing the machine against the wall so as to put the springs 22 under compression. It would be extremely difiicult to hold a machine of this weight and size in position accurately normal to the surface operated 'upon, particularly .as the contemplated operation requires constantly moving the machine from place to place on the surface being operated upon. With a machine constructed as described above, an accurate perpendicular position is not essential. The handle can stand a trifle oblique to the wall surface without interfering with the revolution of the carrier and the surfacing element thereon, and without disturbing the relationship between the working face of the surfacing element and the wall or slab against which it operates.

While I have described my invention in a certain preferred embodiment, it would be possible to make modifications therein without departure from the principles of the in-- rention. Therefore I do not wish to be understood as limiting the invention to the particular constructions, devices, and arrangements shown and described, except so far as such constructions, devices and arrangements are specifically made limitations in certain claims herein. r

1. In a machine of the character described,

the combination with a carrier for a surfac-'--- ing element, of a-suppbrtingzmember on which said carrier is revolubly and yield-.

ingly mounted, a driving shaft. sustained by 1 said supporting member having. a sliding driving connection with said carrier to accommodate itself to the yielding relation between the carrier and the supporting-member, and springs resisting the yield of the carrier.

2. Inamachine-of thecharacter described, the combination with a carrier for a surfacing element, of a supporting member on which said carrier is mounted revolubly, and so as to permit said supporting member and carrier to assume different angular positions with respect to each other, a driving shaft sustained by said supporting member having a driving connection with said carrier.

operated at different angular positions of the supporting member with respect to thecarrier, and springs resisting the angular positioning of the supporting member and the combination with a hollow supporting member, of a driving shaft mountedin said supporting member with its extremity polygonal in cross section, a revoluble carrier for a surfacing element, yieldingly mounted on said supporting member so that the'supporting member may assume different angular positions with respect thereto, said carrier being formed With an opening for the polygonal end of the driving shaft of the same configuration as said shaft but of greater area, and springs resisting the yield of the carrier.

7 5. Inamachine of the character described, the combination with a supporting member of a revoluble carrier for a surfacing ele- 1 L. The combination of a carrier for a member and operable regardless of the relarotary surfacing element, a supporting memtive positions of the hand-hold portion and her therefor having a hand-hold portion, the carrier. resilient means interposed between the hanml ANTONIO Gr. FERRARINI.

hold portion and the carrier providing for Witnesses:

relative movement of said parts, and carrier L. A. FALKENBERG, rotating means mounted in the supporting G. Y. SKINNER. 

